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Load GIF files w/pixels outside the canvas bounds anyway (fix #2211)

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This commit is contained in:
David Capello 2019-12-03 09:16:38 -03:00
parent 6cab7b208c
commit d8b933c3f1
1 changed files with 67 additions and 46 deletions
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113
src/app/file/gif_format.cpp
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@ -24,6 +24,7 @@
#include "base/file_handle.h"
#include "base/fs.h"
#include "doc/doc.h"
#include "gfx/clip.h"
#include "render/dithering.h"
#include "render/ordered_dither.h"
#include "render/quantization.h"
@ -328,8 +329,15 @@ private:
m_gifFile->Image.Width,
m_gifFile->Image.Height);
#if 0 // Generally GIF files should contain frame bounds inside the
// canvas bounds (in other case the GIF will contain pixels that
// are not visible). In case that some app creates an invalid
// GIF files with bounds outside the canvas, we should support
// to load the GIF file anyway (which is what is done by other
// apps).
if (!m_spriteBounds.contains(frameBounds))
throw Exception("Image %d is out of sprite bounds.\n", (int)m_frameNum);
#endif
// Create sprite if this is the first frame
if (!m_sprite)
@ -340,8 +348,11 @@ private:
m_sprite->addFrame(m_frameNum);
// Create a temporary image loading the frame pixels from the GIF file
std::unique_ptr<Image> frameImage(
readFrameIndexedImage(frameBounds));
std::unique_ptr<Image> frameImage;
// We don't know if a GIF file could contain empty bounds (width
// or height=0), but we check this just in case.
if (!frameBounds.isEmpty())
frameImage.reset(readFrameIndexedImage(frameBounds));
GIF_TRACE("GIF: Frame[%d] transparent index = %d\n", (int)m_frameNum, m_localTransparentIndex);
@ -353,7 +364,8 @@ private:
}
// Merge this frame colors with the current palette
updatePalette(frameImage.get());
if (frameImage)
updatePalette(frameImage.get());
// Convert the sprite to RGB if we have more than 256 colors
if ((m_sprite->pixelFormat() == IMAGE_INDEXED) &&
@ -365,11 +377,13 @@ private:
}
// Composite frame with previous frame
if (m_sprite->pixelFormat() == IMAGE_INDEXED) {
compositeIndexedImageToIndexed(frameBounds, frameImage.get());
}
else {
compositeIndexedImageToRgb(frameBounds, frameImage.get());
if (frameImage) {
if (m_sprite->pixelFormat() == IMAGE_INDEXED) {
compositeIndexedImageToIndexed(frameBounds, frameImage.get());
}
else {
compositeIndexedImageToRgb(frameBounds, frameImage.get());
}
}
// Create cel
@ -610,61 +624,68 @@ private:
void compositeIndexedImageToIndexed(const gfx::Rect& frameBounds,
const Image* frameImage) {
const LockImageBits<IndexedTraits> srcBits(
frameImage, gfx::Rect(0, 0, frameBounds.w, frameBounds.h));
LockImageBits<IndexedTraits> dstBits(
m_currentImage.get(), frameBounds);
gfx::Clip clip(frameBounds.x, frameBounds.y, 0, 0,
frameBounds.w, frameBounds.h);
if (!clip.clip(m_currentImage->width(),
m_currentImage->height(),
frameImage->width(),
frameImage->height()))
return;
auto srcIt = srcBits.begin();
auto dstIt = dstBits.begin();
const LockImageBits<IndexedTraits> srcBits(frameImage, clip.srcBounds());
LockImageBits<IndexedTraits> dstBits(m_currentImage.get(), clip.dstBounds());
auto srcIt = srcBits.begin(), srcEnd = srcBits.end();
auto dstIt = dstBits.begin(), dstEnd = dstBits.end();
// Compose the frame image with the previous frame
for (int y=0; y<frameBounds.h; ++y) {
for (int x=0; x<frameBounds.w; ++x, ++srcIt, ++dstIt) {
ASSERT(srcIt != srcBits.end());
ASSERT(dstIt != dstBits.end());
for (; srcIt != srcEnd && dstIt != dstEnd; ++srcIt, ++dstIt) {
color_t i = *srcIt;
if (int(i) == m_localTransparentIndex)
continue;
color_t i = *srcIt;
if (int(i) == m_localTransparentIndex)
continue;
i = m_remap[i];
*dstIt = i;
}
i = m_remap[i];
*dstIt = i;
}
ASSERT(srcIt == srcEnd);
ASSERT(dstIt == dstEnd);
}
void compositeIndexedImageToRgb(const gfx::Rect& frameBounds,
const Image* frameImage) {
const LockImageBits<IndexedTraits> srcBits(
frameImage, gfx::Rect(0, 0, frameBounds.w, frameBounds.h));
LockImageBits<RgbTraits> dstBits(
m_currentImage.get(), frameBounds);
gfx::Clip clip(frameBounds.x, frameBounds.y, 0, 0,
frameBounds.w, frameBounds.h);
if (!clip.clip(m_currentImage->width(),
m_currentImage->height(),
frameImage->width(),
frameImage->height()))
return;
auto srcIt = srcBits.begin();
auto dstIt = dstBits.begin();
const LockImageBits<IndexedTraits> srcBits(frameImage, clip.srcBounds());
LockImageBits<RgbTraits> dstBits(m_currentImage.get(), clip.dstBounds());
auto srcIt = srcBits.begin(), srcEnd = srcBits.end();
auto dstIt = dstBits.begin(), dstEnd = dstBits.end();
ColorMapObject* colormap = getFrameColormap();
// Compose the frame image with the previous frame
for (int y=0; y<frameBounds.h; ++y) {
for (int x=0; x<frameBounds.w; ++x, ++srcIt, ++dstIt) {
ASSERT(srcIt != srcBits.end());
ASSERT(dstIt != dstBits.end());
for (; srcIt != srcEnd && dstIt != dstEnd; ++srcIt, ++dstIt) {
color_t i = *srcIt;
if (int(i) == m_localTransparentIndex)
continue;
color_t i = *srcIt;
if (int(i) == m_localTransparentIndex)
continue;
i = rgba(
colormap->Colors[i].Red,
colormap->Colors[i].Green,
colormap->Colors[i].Blue, 255);
i = rgba(
colormap->Colors[i].Red,
colormap->Colors[i].Green,
colormap->Colors[i].Blue, 255);
*dstIt = i;
}
*dstIt = i;
}
ASSERT(srcIt == srcEnd);
ASSERT(dstIt == dstEnd);
}
void createCel() {