Resolve KASM-2948 "Feature/ qoi support"
Anthony Merrill
3 years ago
committed by
Matthew McClaskey
parent
9622048753
commit
ba8e98a9f6
@ -1,4 +1,4 @@
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[submodule "kasmweb"]
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[submodule "kasmweb"]
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path = kasmweb
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path = kasmweb
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url = https://github.com/kasmtech/noVNC.git
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url = https://github.com/kasmtech/noVNC.git
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branch = master
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branch = qoi-rebase-2
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@ -0,0 +1,274 @@
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/* Copyright (C) 2019 Kasm Web
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <rdr/OutStream.h>
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#include <rfb/encodings.h>
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#include <rfb/LogWriter.h>
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#include <rfb/SConnection.h>
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#include <rfb/ServerCore.h>
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#include <rfb/PixelBuffer.h>
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#include <rfb/TightQOIEncoder.h>
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#include <rfb/TightConstants.h>
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#include <rfb/util.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#define QOI_IMPLEMENTATION
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#define QOI_NO_STDIO
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#include "qoi.h"
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using namespace rfb;
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static LogWriter vlog("QOI");
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static const PixelFormat pfRGBX(32, 24, false, true, 255, 255, 255, 0, 8, 16);
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static const PixelFormat pfBGRX(32, 24, false, true, 255, 255, 255, 16, 8, 0);
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// An optimized version that assumes 4-alignment and RGBX/BGRX
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static void *qoi_encode_kasm(const void *data, const qoi_desc *desc, int *out_len,
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const unsigned isrgb, const unsigned stride) {
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int i, max_size, p, run;
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unsigned px_len, px_end, px_pos, y, x;
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unsigned char *bytes;
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const uint32_t *pixels;
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qoi_rgba_t index[64];
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qoi_rgba_t px, px_prev;
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if (
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data == NULL || out_len == NULL || desc == NULL ||
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desc->width == 0 || desc->height == 0 ||
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desc->channels < 3 || desc->channels > 4 ||
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desc->colorspace > 1 ||
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desc->height >= QOI_PIXELS_MAX / desc->width
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) {
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return NULL;
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}
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max_size =
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desc->width * desc->height * (3 + 1) +
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QOI_HEADER_SIZE + sizeof(qoi_padding);
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p = 0;
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bytes = (unsigned char *) QOI_MALLOC(max_size);
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if (!bytes) {
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return NULL;
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}
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qoi_write_32(bytes, &p, QOI_MAGIC);
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qoi_write_32(bytes, &p, desc->width);
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qoi_write_32(bytes, &p, desc->height);
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bytes[p++] = 3;
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bytes[p++] = desc->colorspace;
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pixels = (const uint32_t *)data;
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QOI_ZEROARR(index);
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run = 0;
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px_prev.rgba.r = 0;
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px_prev.rgba.g = 0;
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px_prev.rgba.b = 0;
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px_prev.rgba.a = 255;
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px = px_prev;
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px_len = desc->width * desc->height;
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px_end = px_len - 1;
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px_pos = 0;
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for (y = 0; y < desc->height; y++) {
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for (x = 0; x < desc->width; x++, px_pos++) {
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const unsigned stridedpos = y * stride + x;
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px.v = pixels[stridedpos];
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if (!isrgb) {
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uint8_t tmp = px.rgba.r;
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px.rgba.r = px.rgba.b;
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px.rgba.b = tmp;
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}
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if (px.v == px_prev.v) {
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run++;
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if (run == 62 || px_pos == px_end) {
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bytes[p++] = QOI_OP_RUN | (run - 1);
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run = 0;
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}
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} else {
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if (run > 0) {
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bytes[p++] = QOI_OP_RUN | (run - 1);
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run = 0;
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}
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signed char vr = px.rgba.r - px_prev.rgba.r;
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signed char vg = px.rgba.g - px_prev.rgba.g;
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signed char vb = px.rgba.b - px_prev.rgba.b;
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signed char vg_r = vr - vg;
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signed char vg_b = vb - vg;
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if (
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vr > -3 && vr < 2 &&
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vg > -3 && vg < 2 &&
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vb > -3 && vb < 2
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) {
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bytes[p++] = QOI_OP_DIFF | (vr + 2) << 4 | (vg + 2) << 2 | (vb + 2);
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} else if (
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vg_r > -9 && vg_r < 8 &&
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vg > -33 && vg < 32 &&
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vg_b > -9 && vg_b < 8
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) {
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bytes[p++] = QOI_OP_LUMA | (vg + 32);
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bytes[p++] = (vg_r + 8) << 4 | (vg_b + 8);
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} else {
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bytes[p++] = QOI_OP_RGB;
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bytes[p++] = px.rgba.r;
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bytes[p++] = px.rgba.g;
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bytes[p++] = px.rgba.b;
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}
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}
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px_prev = px;
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}
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}
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for (i = 0; i < (int)sizeof(qoi_padding); i++) {
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bytes[p++] = qoi_padding[i];
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}
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*out_len = p;
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return bytes;
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}
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TightQOIEncoder::TightQOIEncoder(SConnection* conn) :
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Encoder(conn, encodingTight, (EncoderFlags)(EncoderUseNativePF), -1)
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{
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}
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TightQOIEncoder::~TightQOIEncoder()
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{
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}
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bool TightQOIEncoder::isSupported()
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{
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if (!conn->cp.supportsEncoding(encodingTight))
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return false;
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if (conn->cp.supportsQOI)
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return true;
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// Tight support, but not QOI
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return false;
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}
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void TightQOIEncoder::compressOnly(const PixelBuffer* pb, const uint8_t qualityIn,
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std::vector<uint8_t> &out, const bool lowVideoQuality) const
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{
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const rdr::U8* buffer;
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int stride, len;
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qoi_desc desc;
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void *encoded;
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buffer = pb->getBuffer(pb->getRect(), &stride);
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desc.width = pb->getRect().width();
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desc.height = pb->getRect().height();
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desc.colorspace = QOI_LINEAR;
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desc.channels = 4;
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encoded = qoi_encode_kasm(buffer, &desc, &len, pfRGBX.equal(pb->getPF()), stride);
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if (!encoded) {
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// Error
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vlog.error("QOI error");
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}
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out.resize(len);
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memcpy(&out[0], encoded, len);
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free(encoded);
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}
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void TightQOIEncoder::writeOnly(const std::vector<uint8_t> &out) const
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{
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rdr::OutStream* os;
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os = conn->getOutStream();
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os->writeU8(tightQoi << 4);
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writeCompact(out.size(), os);
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os->writeBytes(&out[0], out.size());
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}
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void TightQOIEncoder::writeRect(const PixelBuffer* pb, const Palette& palette)
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{
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rdr::OutStream* os;
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const rdr::U8* buffer;
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int stride, len;
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qoi_desc desc;
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void *encoded;
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buffer = pb->getBuffer(pb->getRect(), &stride);
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desc.width = pb->getRect().width();
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desc.height = pb->getRect().height();
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desc.colorspace = QOI_LINEAR;
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desc.channels = 4;
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encoded = qoi_encode_kasm(buffer, &desc, &len, pfRGBX.equal(pb->getPF()), stride);
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if (!encoded) {
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// Error
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vlog.error("QOI error");
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}
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os = conn->getOutStream();
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os->writeU8(tightQoi << 4);
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writeCompact(len, os);
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os->writeBytes(encoded, len);
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free(encoded);
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}
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void TightQOIEncoder::writeSolidRect(int width, int height,
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const PixelFormat& pf,
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const rdr::U8* colour)
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{
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// FIXME: Add a shortcut in the JPEG compressor to handle this case
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// without having to use the default fallback which is very slow.
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Encoder::writeSolidRect(width, height, pf, colour);
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}
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void TightQOIEncoder::writeCompact(rdr::U32 value, rdr::OutStream* os) const
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{
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// Copied from TightEncoder as it's overkill to inherit just for this
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rdr::U8 b;
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b = value & 0x7F;
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if (value <= 0x7F) {
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os->writeU8(b);
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} else {
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os->writeU8(b | 0x80);
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b = value >> 7 & 0x7F;
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if (value <= 0x3FFF) {
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os->writeU8(b);
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} else {
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os->writeU8(b | 0x80);
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os->writeU8(value >> 14 & 0xFF);
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}
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}
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}
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@ -0,0 +1,46 @@
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/* Copyright (C) 2022 Kasm Web
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#ifndef __RFB_TIGHTQOIENCODER_H__
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#define __RFB_TIGHTQOIENCODER_H__
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#include <rfb/Encoder.h>
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#include <stdint.h>
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#include <vector>
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namespace rfb {
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class TightQOIEncoder : public Encoder {
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public:
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TightQOIEncoder(SConnection* conn);
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virtual ~TightQOIEncoder();
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virtual bool isSupported();
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virtual void writeRect(const PixelBuffer* pb, const Palette& palette);
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virtual void compressOnly(const PixelBuffer* pb, const uint8_t quality,
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std::vector<uint8_t> &out, const bool lowVideoQuality) const;
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virtual void writeOnly(const std::vector<uint8_t> &out) const;
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virtual void writeSolidRect(int width, int height,
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const PixelFormat& pf,
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const rdr::U8* colour);
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protected:
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void writeCompact(rdr::U32 value, rdr::OutStream* os) const;
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};
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}
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#endif
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@ -0,0 +1,681 @@
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/*
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QOI - The "Quite OK Image" format for fast, lossless image compression
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Dominic Szablewski - https://phoboslab.org
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-- LICENSE: The MIT License(MIT)
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Copyright(c) 2021 Dominic Szablewski
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files(the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and / or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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-- About
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QOI encodes and decodes images in a lossless format. Compared to stb_image and
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stb_image_write QOI offers 20x-50x faster encoding, 3x-4x faster decoding and
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20% better compression.
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-- Synopsis
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// Define `QOI_IMPLEMENTATION` in *one* C/C++ file before including this
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// library to create the implementation.
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#define QOI_IMPLEMENTATION
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#include "qoi.h"
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// Encode and store an RGBA buffer to the file system. The qoi_desc describes
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// the input pixel data.
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qoi_write("image_new.qoi", rgba_pixels, &(qoi_desc){
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.width = 1920,
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.height = 1080,
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.channels = 4,
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.colorspace = QOI_SRGB
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});
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// Load and decode a QOI image from the file system into a 32bbp RGBA buffer.
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// The qoi_desc struct will be filled with the width, height, number of channels
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// and colorspace read from the file header.
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qoi_desc desc;
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void *rgba_pixels = qoi_read("image.qoi", &desc, 4);
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|
|
||||||
|
|
||||||
|
-- Documentation
|
||||||
|
|
||||||
|
This library provides the following functions;
|
||||||
|
- qoi_read -- read and decode a QOI file
|
||||||
|
- qoi_decode -- decode the raw bytes of a QOI image from memory
|
||||||
|
- qoi_write -- encode and write a QOI file
|
||||||
|
- qoi_encode -- encode an rgba buffer into a QOI image in memory
|
||||||
|
|
||||||
|
See the function declaration below for the signature and more information.
|
||||||
|
|
||||||
|
If you don't want/need the qoi_read and qoi_write functions, you can define
|
||||||
|
QOI_NO_STDIO before including this library.
|
||||||
|
|
||||||
|
This library uses malloc() and free(). To supply your own malloc implementation
|
||||||
|
you can define QOI_MALLOC and QOI_FREE before including this library.
|
||||||
|
|
||||||
|
This library uses memset() to zero-initialize the index. To supply your own
|
||||||
|
implementation you can define QOI_ZEROARR before including this library.
|
||||||
|
|
||||||
|
|
||||||
|
-- Data Format
|
||||||
|
|
||||||
|
A QOI file has a 14 byte header, followed by any number of data "chunks" and an
|
||||||
|
8-byte end marker.
|
||||||
|
|
||||||
|
struct qoi_header_t {
|
||||||
|
char magic[4]; // magic bytes "qoif"
|
||||||
|
uint32_t width; // image width in pixels (BE)
|
||||||
|
uint32_t height; // image height in pixels (BE)
|
||||||
|
uint8_t channels; // 3 = RGB, 4 = RGBA
|
||||||
|
uint8_t colorspace; // 0 = sRGB with linear alpha, 1 = all channels linear
|
||||||
|
};
|
||||||
|
|
||||||
|
Images are encoded row by row, left to right, top to bottom. The decoder and
|
||||||
|
encoder start with {r: 0, g: 0, b: 0, a: 255} as the previous pixel value. An
|
||||||
|
image is complete when all pixels specified by width * height have been covered.
|
||||||
|
|
||||||
|
Pixels are encoded as
|
||||||
|
- a run of the previous pixel
|
||||||
|
- an index into an array of previously seen pixels
|
||||||
|
- a difference to the previous pixel value in r,g,b
|
||||||
|
- full r,g,b or r,g,b,a values
|
||||||
|
|
||||||
|
The color channels are assumed to not be premultiplied with the alpha channel
|
||||||
|
("un-premultiplied alpha").
|
||||||
|
|
||||||
|
A running array[64] (zero-initialized) of previously seen pixel values is
|
||||||
|
maintained by the encoder and decoder. Each pixel that is seen by the encoder
|
||||||
|
and decoder is put into this array at the position formed by a hash function of
|
||||||
|
the color value. In the encoder, if the pixel value at the index matches the
|
||||||
|
current pixel, this index position is written to the stream as QOI_OP_INDEX.
|
||||||
|
The hash function for the index is:
|
||||||
|
|
||||||
|
index_position = (r * 3 + g * 5 + b * 7 + a * 11) % 64
|
||||||
|
|
||||||
|
Each chunk starts with a 2- or 8-bit tag, followed by a number of data bits. The
|
||||||
|
bit length of chunks is divisible by 8 - i.e. all chunks are byte aligned. All
|
||||||
|
values encoded in these data bits have the most significant bit on the left.
|
||||||
|
|
||||||
|
The 8-bit tags have precedence over the 2-bit tags. A decoder must check for the
|
||||||
|
presence of an 8-bit tag first.
|
||||||
|
|
||||||
|
The byte stream's end is marked with 7 0x00 bytes followed a single 0x01 byte.
|
||||||
|
|
||||||
|
|
||||||
|
The possible chunks are:
|
||||||
|
|
||||||
|
|
||||||
|
.- QOI_OP_INDEX ----------.
|
||||||
|
| Byte[0] |
|
||||||
|
| 7 6 5 4 3 2 1 0 |
|
||||||
|
|-------+-----------------|
|
||||||
|
| 0 0 | index |
|
||||||
|
`-------------------------`
|
||||||
|
2-bit tag b00
|
||||||
|
6-bit index into the color index array: 0..63
|
||||||
|
|
||||||
|
A valid encoder must not issue 2 or more consecutive QOI_OP_INDEX chunks to the
|
||||||
|
same index. QOI_OP_RUN should be used instead.
|
||||||
|
|
||||||
|
|
||||||
|
.- QOI_OP_DIFF -----------.
|
||||||
|
| Byte[0] |
|
||||||
|
| 7 6 5 4 3 2 1 0 |
|
||||||
|
|-------+-----+-----+-----|
|
||||||
|
| 0 1 | dr | dg | db |
|
||||||
|
`-------------------------`
|
||||||
|
2-bit tag b01
|
||||||
|
2-bit red channel difference from the previous pixel between -2..1
|
||||||
|
2-bit green channel difference from the previous pixel between -2..1
|
||||||
|
2-bit blue channel difference from the previous pixel between -2..1
|
||||||
|
|
||||||
|
The difference to the current channel values are using a wraparound operation,
|
||||||
|
so "1 - 2" will result in 255, while "255 + 1" will result in 0.
|
||||||
|
|
||||||
|
Values are stored as unsigned integers with a bias of 2. E.g. -2 is stored as
|
||||||
|
0 (b00). 1 is stored as 3 (b11).
|
||||||
|
|
||||||
|
The alpha value remains unchanged from the previous pixel.
|
||||||
|
|
||||||
|
|
||||||
|
.- QOI_OP_LUMA -------------------------------------.
|
||||||
|
| Byte[0] | Byte[1] |
|
||||||
|
| 7 6 5 4 3 2 1 0 | 7 6 5 4 3 2 1 0 |
|
||||||
|
|-------+-----------------+-------------+-----------|
|
||||||
|
| 1 0 | green diff | dr - dg | db - dg |
|
||||||
|
`---------------------------------------------------`
|
||||||
|
2-bit tag b10
|
||||||
|
6-bit green channel difference from the previous pixel -32..31
|
||||||
|
4-bit red channel difference minus green channel difference -8..7
|
||||||
|
4-bit blue channel difference minus green channel difference -8..7
|
||||||
|
|
||||||
|
The green channel is used to indicate the general direction of change and is
|
||||||
|
encoded in 6 bits. The red and blue channels (dr and db) base their diffs off
|
||||||
|
of the green channel difference and are encoded in 4 bits. I.e.:
|
||||||
|
dr_dg = (cur_px.r - prev_px.r) - (cur_px.g - prev_px.g)
|
||||||
|
db_dg = (cur_px.b - prev_px.b) - (cur_px.g - prev_px.g)
|
||||||
|
|
||||||
|
The difference to the current channel values are using a wraparound operation,
|
||||||
|
so "10 - 13" will result in 253, while "250 + 7" will result in 1.
|
||||||
|
|
||||||
|
Values are stored as unsigned integers with a bias of 32 for the green channel
|
||||||
|
and a bias of 8 for the red and blue channel.
|
||||||
|
|
||||||
|
The alpha value remains unchanged from the previous pixel.
|
||||||
|
|
||||||
|
|
||||||
|
.- QOI_OP_RUN ------------.
|
||||||
|
| Byte[0] |
|
||||||
|
| 7 6 5 4 3 2 1 0 |
|
||||||
|
|-------+-----------------|
|
||||||
|
| 1 1 | run |
|
||||||
|
`-------------------------`
|
||||||
|
2-bit tag b11
|
||||||
|
6-bit run-length repeating the previous pixel: 1..62
|
||||||
|
|
||||||
|
The run-length is stored with a bias of -1. Note that the run-lengths 63 and 64
|
||||||
|
(b111110 and b111111) are illegal as they are occupied by the QOI_OP_RGB and
|
||||||
|
QOI_OP_RGBA tags.
|
||||||
|
|
||||||
|
|
||||||
|
.- QOI_OP_RGB ------------------------------------------.
|
||||||
|
| Byte[0] | Byte[1] | Byte[2] | Byte[3] |
|
||||||
|
| 7 6 5 4 3 2 1 0 | 7 .. 0 | 7 .. 0 | 7 .. 0 |
|
||||||
|
|-------------------------+---------+---------+---------|
|
||||||
|
| 1 1 1 1 1 1 1 0 | red | green | blue |
|
||||||
|
`-------------------------------------------------------`
|
||||||
|
8-bit tag b11111110
|
||||||
|
8-bit red channel value
|
||||||
|
8-bit green channel value
|
||||||
|
8-bit blue channel value
|
||||||
|
|
||||||
|
The alpha value remains unchanged from the previous pixel.
|
||||||
|
|
||||||
|
|
||||||
|
.- QOI_OP_RGBA ---------------------------------------------------.
|
||||||
|
| Byte[0] | Byte[1] | Byte[2] | Byte[3] | Byte[4] |
|
||||||
|
| 7 6 5 4 3 2 1 0 | 7 .. 0 | 7 .. 0 | 7 .. 0 | 7 .. 0 |
|
||||||
|
|-------------------------+---------+---------+---------+---------|
|
||||||
|
| 1 1 1 1 1 1 1 1 | red | green | blue | alpha |
|
||||||
|
`-----------------------------------------------------------------`
|
||||||
|
8-bit tag b11111111
|
||||||
|
8-bit red channel value
|
||||||
|
8-bit green channel value
|
||||||
|
8-bit blue channel value
|
||||||
|
8-bit alpha channel value
|
||||||
|
|
||||||
|
*/
|
||||||
|
|
||||||
|
|
||||||
|
/* -----------------------------------------------------------------------------
|
||||||
|
Header - Public functions */
|
||||||
|
|
||||||
|
#ifndef QOI_H
|
||||||
|
#define QOI_H
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
extern "C" {
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* A pointer to a qoi_desc struct has to be supplied to all of qoi's functions.
|
||||||
|
It describes either the input format (for qoi_write and qoi_encode), or is
|
||||||
|
filled with the description read from the file header (for qoi_read and
|
||||||
|
qoi_decode).
|
||||||
|
|
||||||
|
The colorspace in this qoi_desc is an enum where
|
||||||
|
0 = sRGB, i.e. gamma scaled RGB channels and a linear alpha channel
|
||||||
|
1 = all channels are linear
|
||||||
|
You may use the constants QOI_SRGB or QOI_LINEAR. The colorspace is purely
|
||||||
|
informative. It will be saved to the file header, but does not affect
|
||||||
|
how chunks are en-/decoded. */
|
||||||
|
|
||||||
|
#define QOI_SRGB 0
|
||||||
|
#define QOI_LINEAR 1
|
||||||
|
|
||||||
|
typedef struct {
|
||||||
|
unsigned int width;
|
||||||
|
unsigned int height;
|
||||||
|
unsigned char channels;
|
||||||
|
unsigned char colorspace;
|
||||||
|
} qoi_desc;
|
||||||
|
|
||||||
|
#ifndef QOI_NO_STDIO
|
||||||
|
|
||||||
|
/* Encode raw RGB or RGBA pixels into a QOI image and write it to the file
|
||||||
|
system. The qoi_desc struct must be filled with the image width, height,
|
||||||
|
number of channels (3 = RGB, 4 = RGBA) and the colorspace.
|
||||||
|
|
||||||
|
The function returns 0 on failure (invalid parameters, or fopen or malloc
|
||||||
|
failed) or the number of bytes written on success. */
|
||||||
|
|
||||||
|
int qoi_write(const char *filename, const void *data, const qoi_desc *desc);
|
||||||
|
|
||||||
|
|
||||||
|
/* Read and decode a QOI image from the file system. If channels is 0, the
|
||||||
|
number of channels from the file header is used. If channels is 3 or 4 the
|
||||||
|
output format will be forced into this number of channels.
|
||||||
|
|
||||||
|
The function either returns NULL on failure (invalid data, or malloc or fopen
|
||||||
|
failed) or a pointer to the decoded pixels. On success, the qoi_desc struct
|
||||||
|
will be filled with the description from the file header.
|
||||||
|
|
||||||
|
The returned pixel data should be free()d after use. */
|
||||||
|
|
||||||
|
void *qoi_read(const char *filename, qoi_desc *desc, int channels);
|
||||||
|
|
||||||
|
#endif /* QOI_NO_STDIO */
|
||||||
|
|
||||||
|
|
||||||
|
/* Encode raw RGB or RGBA pixels into a QOI image in memory.
|
||||||
|
|
||||||
|
The function either returns NULL on failure (invalid parameters or malloc
|
||||||
|
failed) or a pointer to the encoded data on success. On success the out_len
|
||||||
|
is set to the size in bytes of the encoded data.
|
||||||
|
|
||||||
|
The returned qoi data should be free()d after use. */
|
||||||
|
|
||||||
|
void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len,
|
||||||
|
const unsigned isrgb, const unsigned stride);
|
||||||
|
|
||||||
|
|
||||||
|
/* Decode a QOI image from memory.
|
||||||
|
|
||||||
|
The function either returns NULL on failure (invalid parameters or malloc
|
||||||
|
failed) or a pointer to the decoded pixels. On success, the qoi_desc struct
|
||||||
|
is filled with the description from the file header.
|
||||||
|
|
||||||
|
The returned pixel data should be free()d after use. */
|
||||||
|
|
||||||
|
void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels);
|
||||||
|
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
#endif /* QOI_H */
|
||||||
|
|
||||||
|
|
||||||
|
/* -----------------------------------------------------------------------------
|
||||||
|
Implementation */
|
||||||
|
|
||||||
|
#ifdef QOI_IMPLEMENTATION
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <string.h>
|
||||||
|
|
||||||
|
#ifndef QOI_MALLOC
|
||||||
|
#define QOI_MALLOC(sz) malloc(sz)
|
||||||
|
#define QOI_FREE(p) free(p)
|
||||||
|
#endif
|
||||||
|
#ifndef QOI_ZEROARR
|
||||||
|
#define QOI_ZEROARR(a) memset((a),0,sizeof(a))
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define QOI_OP_INDEX 0x00 /* 00xxxxxx */
|
||||||
|
#define QOI_OP_DIFF 0x40 /* 01xxxxxx */
|
||||||
|
#define QOI_OP_LUMA 0x80 /* 10xxxxxx */
|
||||||
|
#define QOI_OP_RUN 0xc0 /* 11xxxxxx */
|
||||||
|
#define QOI_OP_RGB 0xfe /* 11111110 */
|
||||||
|
#define QOI_OP_RGBA 0xff /* 11111111 */
|
||||||
|
|
||||||
|
#define QOI_MASK_2 0xc0 /* 11000000 */
|
||||||
|
|
||||||
|
#define QOI_COLOR_HASH(C) (C.rgba.r*3 + C.rgba.g*5 + C.rgba.b*7 + C.rgba.a*11)
|
||||||
|
#define QOI_MAGIC \
|
||||||
|
(((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \
|
||||||
|
((unsigned int)'i') << 8 | ((unsigned int)'f'))
|
||||||
|
#define QOI_HEADER_SIZE 14
|
||||||
|
|
||||||
|
/* 2GB is the max file size that this implementation can safely handle. We guard
|
||||||
|
against anything larger than that, assuming the worst case with 5 bytes per
|
||||||
|
pixel, rounded down to a nice clean value. 400 million pixels ought to be
|
||||||
|
enough for anybody. */
|
||||||
|
#define QOI_PIXELS_MAX ((unsigned int)400000000)
|
||||||
|
|
||||||
|
typedef union {
|
||||||
|
struct { unsigned char r, g, b, a; } rgba;
|
||||||
|
unsigned int v;
|
||||||
|
} qoi_rgba_t;
|
||||||
|
|
||||||
|
static const unsigned char qoi_padding[8] = {0,0,0,0,0,0,0,1};
|
||||||
|
|
||||||
|
static void qoi_write_32(unsigned char *bytes, int *p, unsigned int v) {
|
||||||
|
bytes[(*p)++] = (0xff000000 & v) >> 24;
|
||||||
|
bytes[(*p)++] = (0x00ff0000 & v) >> 16;
|
||||||
|
bytes[(*p)++] = (0x0000ff00 & v) >> 8;
|
||||||
|
bytes[(*p)++] = (0x000000ff & v);
|
||||||
|
}
|
||||||
|
|
||||||
|
static unsigned int qoi_read_32(const unsigned char *bytes, int *p) {
|
||||||
|
unsigned int a = bytes[(*p)++];
|
||||||
|
unsigned int b = bytes[(*p)++];
|
||||||
|
unsigned int c = bytes[(*p)++];
|
||||||
|
unsigned int d = bytes[(*p)++];
|
||||||
|
return a << 24 | b << 16 | c << 8 | d;
|
||||||
|
}
|
||||||
|
|
||||||
|
void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len, const unsigned isrgb,
|
||||||
|
const unsigned stride) {
|
||||||
|
int i, max_size, p, run;
|
||||||
|
int px_len, px_end, px_pos, channels;
|
||||||
|
unsigned char *bytes;
|
||||||
|
const unsigned char *pixels;
|
||||||
|
qoi_rgba_t index[64];
|
||||||
|
qoi_rgba_t px, px_prev;
|
||||||
|
|
||||||
|
if (
|
||||||
|
data == NULL || out_len == NULL || desc == NULL ||
|
||||||
|
desc->width == 0 || desc->height == 0 ||
|
||||||
|
desc->channels < 3 || desc->channels > 4 ||
|
||||||
|
desc->colorspace > 1 ||
|
||||||
|
desc->height >= QOI_PIXELS_MAX / desc->width
|
||||||
|
) {
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
max_size =
|
||||||
|
desc->width * desc->height * (desc->channels + 1) +
|
||||||
|
QOI_HEADER_SIZE + sizeof(qoi_padding);
|
||||||
|
|
||||||
|
p = 0;
|
||||||
|
bytes = (unsigned char *) QOI_MALLOC(max_size);
|
||||||
|
if (!bytes) {
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
qoi_write_32(bytes, &p, QOI_MAGIC);
|
||||||
|
qoi_write_32(bytes, &p, desc->width);
|
||||||
|
qoi_write_32(bytes, &p, desc->height);
|
||||||
|
bytes[p++] = desc->channels;
|
||||||
|
bytes[p++] = desc->colorspace;
|
||||||
|
|
||||||
|
|
||||||
|
pixels = (const unsigned char *)data;
|
||||||
|
|
||||||
|
QOI_ZEROARR(index);
|
||||||
|
|
||||||
|
run = 0;
|
||||||
|
px_prev.rgba.r = 0;
|
||||||
|
px_prev.rgba.g = 0;
|
||||||
|
px_prev.rgba.b = 0;
|
||||||
|
px_prev.rgba.a = 255;
|
||||||
|
px = px_prev;
|
||||||
|
|
||||||
|
px_len = desc->width * desc->height * desc->channels;
|
||||||
|
px_end = px_len - desc->channels;
|
||||||
|
channels = desc->channels;
|
||||||
|
|
||||||
|
for (px_pos = 0; px_pos < px_len; px_pos += channels) {
|
||||||
|
const unsigned y = (px_pos / channels) / desc->width;
|
||||||
|
const unsigned x = (px_pos / channels) % desc->width;
|
||||||
|
const unsigned stridedpos = y * stride + x * channels;
|
||||||
|
|
||||||
|
if (isrgb) {
|
||||||
|
px.rgba.r = pixels[stridedpos + 0];
|
||||||
|
px.rgba.g = pixels[stridedpos + 1];
|
||||||
|
px.rgba.b = pixels[stridedpos + 2];
|
||||||
|
} else {
|
||||||
|
px.rgba.b = pixels[stridedpos + 0];
|
||||||
|
px.rgba.g = pixels[stridedpos + 1];
|
||||||
|
px.rgba.r = pixels[stridedpos + 2];
|
||||||
|
}
|
||||||
|
|
||||||
|
if (channels == 4) {
|
||||||
|
px.rgba.a = pixels[stridedpos + 3];
|
||||||
|
}
|
||||||
|
|
||||||
|
if (px.v == px_prev.v) {
|
||||||
|
run++;
|
||||||
|
if (run == 62 || px_pos == px_end) {
|
||||||
|
bytes[p++] = QOI_OP_RUN | (run - 1);
|
||||||
|
run = 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
int index_pos;
|
||||||
|
|
||||||
|
if (run > 0) {
|
||||||
|
bytes[p++] = QOI_OP_RUN | (run - 1);
|
||||||
|
run = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
index_pos = QOI_COLOR_HASH(px) % 64;
|
||||||
|
|
||||||
|
if (index[index_pos].v == px.v) {
|
||||||
|
bytes[p++] = QOI_OP_INDEX | index_pos;
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
index[index_pos] = px;
|
||||||
|
|
||||||
|
if (px.rgba.a == px_prev.rgba.a) {
|
||||||
|
signed char vr = px.rgba.r - px_prev.rgba.r;
|
||||||
|
signed char vg = px.rgba.g - px_prev.rgba.g;
|
||||||
|
signed char vb = px.rgba.b - px_prev.rgba.b;
|
||||||
|
|
||||||
|
signed char vg_r = vr - vg;
|
||||||
|
signed char vg_b = vb - vg;
|
||||||
|
|
||||||
|
if (
|
||||||
|
vr > -3 && vr < 2 &&
|
||||||
|
vg > -3 && vg < 2 &&
|
||||||
|
vb > -3 && vb < 2
|
||||||
|
) {
|
||||||
|
bytes[p++] = QOI_OP_DIFF | (vr + 2) << 4 | (vg + 2) << 2 | (vb + 2);
|
||||||
|
}
|
||||||
|
else if (
|
||||||
|
vg_r > -9 && vg_r < 8 &&
|
||||||
|
vg > -33 && vg < 32 &&
|
||||||
|
vg_b > -9 && vg_b < 8
|
||||||
|
) {
|
||||||
|
bytes[p++] = QOI_OP_LUMA | (vg + 32);
|
||||||
|
bytes[p++] = (vg_r + 8) << 4 | (vg_b + 8);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
bytes[p++] = QOI_OP_RGB;
|
||||||
|
bytes[p++] = px.rgba.r;
|
||||||
|
bytes[p++] = px.rgba.g;
|
||||||
|
bytes[p++] = px.rgba.b;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
bytes[p++] = QOI_OP_RGBA;
|
||||||
|
bytes[p++] = px.rgba.r;
|
||||||
|
bytes[p++] = px.rgba.g;
|
||||||
|
bytes[p++] = px.rgba.b;
|
||||||
|
bytes[p++] = px.rgba.a;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
px_prev = px;
|
||||||
|
}
|
||||||
|
|
||||||
|
for (i = 0; i < (int)sizeof(qoi_padding); i++) {
|
||||||
|
bytes[p++] = qoi_padding[i];
|
||||||
|
}
|
||||||
|
|
||||||
|
*out_len = p;
|
||||||
|
return bytes;
|
||||||
|
}
|
||||||
|
|
||||||
|
void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels) {
|
||||||
|
const unsigned char *bytes;
|
||||||
|
unsigned int header_magic;
|
||||||
|
unsigned char *pixels;
|
||||||
|
qoi_rgba_t index[64];
|
||||||
|
qoi_rgba_t px;
|
||||||
|
int px_len, chunks_len, px_pos;
|
||||||
|
int p = 0, run = 0;
|
||||||
|
|
||||||
|
if (
|
||||||
|
data == NULL || desc == NULL ||
|
||||||
|
(channels != 0 && channels != 3 && channels != 4) ||
|
||||||
|
size < QOI_HEADER_SIZE + (int)sizeof(qoi_padding)
|
||||||
|
) {
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
bytes = (const unsigned char *)data;
|
||||||
|
|
||||||
|
header_magic = qoi_read_32(bytes, &p);
|
||||||
|
desc->width = qoi_read_32(bytes, &p);
|
||||||
|
desc->height = qoi_read_32(bytes, &p);
|
||||||
|
desc->channels = bytes[p++];
|
||||||
|
desc->colorspace = bytes[p++];
|
||||||
|
|
||||||
|
if (
|
||||||
|
desc->width == 0 || desc->height == 0 ||
|
||||||
|
desc->channels < 3 || desc->channels > 4 ||
|
||||||
|
desc->colorspace > 1 ||
|
||||||
|
header_magic != QOI_MAGIC ||
|
||||||
|
desc->height >= QOI_PIXELS_MAX / desc->width
|
||||||
|
) {
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (channels == 0) {
|
||||||
|
channels = desc->channels;
|
||||||
|
}
|
||||||
|
|
||||||
|
px_len = desc->width * desc->height * channels;
|
||||||
|
pixels = (unsigned char *) QOI_MALLOC(px_len);
|
||||||
|
if (!pixels) {
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
QOI_ZEROARR(index);
|
||||||
|
px.rgba.r = 0;
|
||||||
|
px.rgba.g = 0;
|
||||||
|
px.rgba.b = 0;
|
||||||
|
px.rgba.a = 255;
|
||||||
|
|
||||||
|
chunks_len = size - (int)sizeof(qoi_padding);
|
||||||
|
for (px_pos = 0; px_pos < px_len; px_pos += channels) {
|
||||||
|
if (run > 0) {
|
||||||
|
run--;
|
||||||
|
}
|
||||||
|
else if (p < chunks_len) {
|
||||||
|
int b1 = bytes[p++];
|
||||||
|
|
||||||
|
if (b1 == QOI_OP_RGB) {
|
||||||
|
px.rgba.r = bytes[p++];
|
||||||
|
px.rgba.g = bytes[p++];
|
||||||
|
px.rgba.b = bytes[p++];
|
||||||
|
}
|
||||||
|
else if (b1 == QOI_OP_RGBA) {
|
||||||
|
px.rgba.r = bytes[p++];
|
||||||
|
px.rgba.g = bytes[p++];
|
||||||
|
px.rgba.b = bytes[p++];
|
||||||
|
px.rgba.a = bytes[p++];
|
||||||
|
}
|
||||||
|
else if ((b1 & QOI_MASK_2) == QOI_OP_INDEX) {
|
||||||
|
px = index[b1];
|
||||||
|
}
|
||||||
|
else if ((b1 & QOI_MASK_2) == QOI_OP_DIFF) {
|
||||||
|
px.rgba.r += ((b1 >> 4) & 0x03) - 2;
|
||||||
|
px.rgba.g += ((b1 >> 2) & 0x03) - 2;
|
||||||
|
px.rgba.b += ( b1 & 0x03) - 2;
|
||||||
|
}
|
||||||
|
else if ((b1 & QOI_MASK_2) == QOI_OP_LUMA) {
|
||||||
|
int b2 = bytes[p++];
|
||||||
|
int vg = (b1 & 0x3f) - 32;
|
||||||
|
px.rgba.r += vg - 8 + ((b2 >> 4) & 0x0f);
|
||||||
|
px.rgba.g += vg;
|
||||||
|
px.rgba.b += vg - 8 + (b2 & 0x0f);
|
||||||
|
}
|
||||||
|
else if ((b1 & QOI_MASK_2) == QOI_OP_RUN) {
|
||||||
|
run = (b1 & 0x3f);
|
||||||
|
}
|
||||||
|
|
||||||
|
index[QOI_COLOR_HASH(px) % 64] = px;
|
||||||
|
}
|
||||||
|
|
||||||
|
pixels[px_pos + 0] = px.rgba.r;
|
||||||
|
pixels[px_pos + 1] = px.rgba.g;
|
||||||
|
pixels[px_pos + 2] = px.rgba.b;
|
||||||
|
|
||||||
|
if (channels == 4) {
|
||||||
|
pixels[px_pos + 3] = px.rgba.a;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return pixels;
|
||||||
|
}
|
||||||
|
|
||||||
|
#ifndef QOI_NO_STDIO
|
||||||
|
#include <stdio.h>
|
||||||
|
|
||||||
|
int qoi_write(const char *filename, const void *data, const qoi_desc *desc) {
|
||||||
|
FILE *f = fopen(filename, "wb");
|
||||||
|
int size;
|
||||||
|
void *encoded;
|
||||||
|
|
||||||
|
if (!f) {
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
encoded = qoi_encode(data, desc, &size);
|
||||||
|
if (!encoded) {
|
||||||
|
fclose(f);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
fwrite(encoded, 1, size, f);
|
||||||
|
fclose(f);
|
||||||
|
|
||||||
|
QOI_FREE(encoded);
|
||||||
|
return size;
|
||||||
|
}
|
||||||
|
|
||||||
|
void *qoi_read(const char *filename, qoi_desc *desc, int channels) {
|
||||||
|
FILE *f = fopen(filename, "rb");
|
||||||
|
int size, bytes_read;
|
||||||
|
void *pixels, *data;
|
||||||
|
|
||||||
|
if (!f) {
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
fseek(f, 0, SEEK_END);
|
||||||
|
size = ftell(f);
|
||||||
|
if (size <= 0) {
|
||||||
|
fclose(f);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
fseek(f, 0, SEEK_SET);
|
||||||
|
|
||||||
|
data = QOI_MALLOC(size);
|
||||||
|
if (!data) {
|
||||||
|
fclose(f);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
bytes_read = fread(data, 1, size, f);
|
||||||
|
fclose(f);
|
||||||
|
|
||||||
|
pixels = qoi_decode(data, bytes_read, desc, channels);
|
||||||
|
QOI_FREE(data);
|
||||||
|
return pixels;
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif /* QOI_NO_STDIO */
|
||||||
|
#endif /* QOI_IMPLEMENTATION */
|
||||||
Loading…
Reference in New Issue