GifPixRect::GifPixRect(GifFileType *gifFile, int i)
: PixRect(theApp.m_device, PIXRECT_PLAINSURFACE, getImageSize(gifFile, i)) {
const SavedImage &image = gifFile->SavedImages[i];
copyRasterBits(image.RasterBits, image.ImageDesc.ColorMap ? image.ImageDesc.ColorMap->Colors : gifFile->SColorMap->Colors);
m_topLeft = CPoint(image.ImageDesc.Left, image.ImageDesc.Top);
if(DGifSavedExtensionToGCB(gifFile, i, &m_gcb) != GIF_OK) {
m_gcb = getDefaultGCB();
}
}
bool MCGIFImageLoader::LoadFrames(MCBitmapFrame *&r_frames, uint32_t &r_count)
{
bool t_success;
t_success = true;
MCImageBitmap *t_canvas;
t_canvas = nil;
// restoration info
MCImageBitmap *t_restore_image = nil;
int t_disposal_mode = DISPOSAL_UNSPECIFIED;
MCRectangle t_disposal_region = kMCEmptyRectangle;
// The list of frames.
MCBitmapFrame *t_frames = nil;
t_success = GIF_OK == DGifSlurp(m_gif);
// Fetch the width and height of the virtual canvas.
int32_t t_width, t_height;
if (t_success)
{
t_width = m_gif -> SWidth;
t_height = m_gif -> SHeight;
// create the canvas image
t_success = MCImageBitmapCreate(t_width, t_height, t_canvas);
}
// The current frame count. The number of frames is the same as the
// number of images in the GIF.
uint32_t t_frame_count;
t_frame_count = 0;
// If true, the new image will be merged with the old - otherwise the mask
// replaces it.
bool t_overlay;
t_overlay = false;
// Loop through all the images, making frames as we go.
for(uindex_t i = 0; t_success && i < m_gif -> ImageCount; i++)
{
// Process the disposal.
switch (t_disposal_mode)
{
case DISPOSE_BACKGROUND:
gif_fill_image_region(t_canvas, t_disposal_region, 0);
break;
case DISPOSE_PREVIOUS:
if (t_restore_image != nil)
gif_paste_image(t_canvas, t_restore_image, t_disposal_region.x, t_disposal_region.y);
break;
case DISPOSE_DO_NOT:
t_overlay = true;
break;
default:
t_overlay = false;
break;
}
// Fetch the image information.
GraphicsControlBlock t_image_gcb;
MCRectangle t_image_region;
ColorMapObject *t_image_colors = nil;
int32_t t_image_transparency;
int32_t t_image_delay;
int32_t t_image_disposal;
GifByteType *t_image_raster;
// First the information from the image description.
t_image_region.x = m_gif -> SavedImages[i] . ImageDesc . Left;
t_image_region.y = m_gif -> SavedImages[i] . ImageDesc . Top;
t_image_region.width = m_gif -> SavedImages[i] . ImageDesc . Width;
t_image_region.height = m_gif -> SavedImages[i] . ImageDesc . Height;
t_image_colors = m_gif -> SavedImages[i] . ImageDesc . ColorMap;
t_image_raster = m_gif -> SavedImages[i] . RasterBits;
if (t_image_colors == nil)
t_image_colors = m_gif -> SColorMap;
// Then the information from the GCB.
if (GIF_OK == DGifSavedExtensionToGCB(m_gif, i, &t_image_gcb))
{
t_image_transparency = t_image_gcb . TransparentColor;
t_image_delay = t_image_gcb . DelayTime;
t_image_disposal = t_image_gcb . DisposalMode;
}
else
{
t_image_transparency = -1;
t_image_delay = 0;
t_image_disposal = DISPOSAL_UNSPECIFIED;
}
// If disposal is 'previous' then cache the portion of the canvas we are
// about to affect.
if (t_image_disposal == DISPOSE_PREVIOUS)
{
if (t_restore_image != nil)
{
if (t_disposal_mode != DISPOSE_PREVIOUS ||
!MCU_equal_rect(t_disposal_region, t_image_region))
{
MCImageFreeBitmap(t_restore_image);
t_restore_image = nil;
}
}
if (t_restore_image == nil)
t_success = MCImageCopyBitmapRegion(t_canvas, t_image_region, t_restore_image);
}
if (t_success)
{
// Render the image into the canvas.
gif_draw_image_into_canvas(t_canvas, t_image_raster,
t_image_region.x, t_image_region.y, t_image_region.width, t_image_region.height,
t_image_colors, t_image_transparency, t_overlay);
// Generate our frame.
t_success = MCMemoryResizeArray(t_frame_count + 1, t_frames, t_frame_count);
}
MCImageBitmap *t_frame_bitmap = nil;
if (t_success)
t_success = MCImageCopyBitmap(t_canvas, t_frame_bitmap);
if (t_success)
{
MCImageBitmapCheckTransparency(t_frame_bitmap);
t_frames[t_frame_count - 1].image = t_frame_bitmap;
t_frames[t_frame_count - 1].duration = t_image_delay * 10; // convert 1/100 seconds to milliseconds
t_frames[t_frame_count - 1].x_scale = t_frames[t_frame_count - 1].y_scale = 1.0;
}
t_disposal_region = t_image_region;
t_disposal_mode = t_image_disposal;
}
MCImageFreeBitmap(t_canvas);
MCImageFreeBitmap(t_restore_image);
if (t_success)
{
r_frames = t_frames;
r_count = t_frame_count;
}
else
MCImageFreeFrames(t_frames, t_frame_count);
return t_success;
}
// Read animated GIF bitstream from 'filename' into 'AnimatedImage' struct.
static int ReadAnimatedGIF(const char filename[], AnimatedImage* const image,
int dump_frames, const char dump_folder[]) {
uint32_t frame_count;
uint32_t canvas_width, canvas_height;
uint32_t i;
int gif_error;
GifFileType* gif;
gif = DGifOpenFileName(filename, NULL);
if (gif == NULL) {
fprintf(stderr, "Could not read file: %s.\n", filename);
return 0;
}
gif_error = DGifSlurp(gif);
if (gif_error != GIF_OK) {
fprintf(stderr, "Could not parse image: %s.\n", filename);
GIFDisplayError(gif, gif_error);
DGifCloseFile(gif, NULL);
return 0;
}
// Animation properties.
image->canvas_width = (uint32_t)gif->SWidth;
image->canvas_height = (uint32_t)gif->SHeight;
if (image->canvas_width > MAX_CANVAS_SIZE ||
image->canvas_height > MAX_CANVAS_SIZE) {
fprintf(stderr, "Invalid canvas dimension: %d x %d\n",
image->canvas_width, image->canvas_height);
DGifCloseFile(gif, NULL);
return 0;
}
image->loop_count = GetLoopCountGIF(gif);
image->bgcolor = GetBackgroundColorGIF(gif);
frame_count = (uint32_t)gif->ImageCount;
if (frame_count == 0) {
DGifCloseFile(gif, NULL);
return 0;
}
if (image->canvas_width == 0 || image->canvas_height == 0) {
image->canvas_width = gif->SavedImages[0].ImageDesc.Width;
image->canvas_height = gif->SavedImages[0].ImageDesc.Height;
gif->SavedImages[0].ImageDesc.Left = 0;
gif->SavedImages[0].ImageDesc.Top = 0;
if (image->canvas_width == 0 || image->canvas_height == 0) {
fprintf(stderr, "Invalid canvas size in GIF.\n");
DGifCloseFile(gif, NULL);
return 0;
}
}
// Allocate frames.
AllocateFrames(image, frame_count);
canvas_width = image->canvas_width;
canvas_height = image->canvas_height;
// Decode and reconstruct frames.
for (i = 0; i < frame_count; ++i) {
const int canvas_width_in_bytes = canvas_width * kNumChannels;
const SavedImage* const curr_gif_image = &gif->SavedImages[i];
GraphicsControlBlock curr_gcb;
DecodedFrame* curr_frame;
uint8_t* curr_rgba;
memset(&curr_gcb, 0, sizeof(curr_gcb));
DGifSavedExtensionToGCB(gif, i, &curr_gcb);
curr_frame = &image->frames[i];
curr_rgba = curr_frame->rgba;
curr_frame->duration = GetFrameDurationGIF(gif, i);
if (i == 0) { // Initialize as transparent.
curr_frame->is_key_frame = 1;
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
} else {
DecodedFrame* const prev_frame = &image->frames[i - 1];
const GifImageDesc* const prev_desc = &gif->SavedImages[i - 1].ImageDesc;
GraphicsControlBlock prev_gcb;
memset(&prev_gcb, 0, sizeof(prev_gcb));
DGifSavedExtensionToGCB(gif, i - 1, &prev_gcb);
curr_frame->is_key_frame =
IsKeyFrameGIF(prev_desc, prev_gcb.DisposalMode, prev_frame,
canvas_width, canvas_height);
if (curr_frame->is_key_frame) { // Initialize as transparent.
ZeroFillCanvas(curr_rgba, canvas_width, canvas_height);
} else {
int prev_frame_disposed, curr_frame_opaque;
int prev_frame_completely_covered;
// Initialize with previous canvas.
uint8_t* const prev_rgba = image->frames[i - 1].rgba;
CopyCanvas(prev_rgba, curr_rgba, canvas_width, canvas_height);
// Dispose previous frame rectangle.
prev_frame_disposed =
(prev_gcb.DisposalMode == DISPOSE_BACKGROUND ||
prev_gcb.DisposalMode == DISPOSE_PREVIOUS);
curr_frame_opaque =
(curr_gcb.TransparentColor == NO_TRANSPARENT_COLOR);
prev_frame_completely_covered =
curr_frame_opaque &&
CoversFrameGIF(&curr_gif_image->ImageDesc, prev_desc);
if (prev_frame_disposed && !prev_frame_completely_covered) {
switch (prev_gcb.DisposalMode) {
case DISPOSE_BACKGROUND: {
ZeroFillFrameRect(curr_rgba, canvas_width_in_bytes,
prev_desc->Left, prev_desc->Top,
prev_desc->Width, prev_desc->Height);
break;
}
case DISPOSE_PREVIOUS: {
int src_frame_num = i - 2;
while (src_frame_num >= 0) {
GraphicsControlBlock src_frame_gcb;
memset(&src_frame_gcb, 0, sizeof(src_frame_gcb));
DGifSavedExtensionToGCB(gif, src_frame_num, &src_frame_gcb);
if (src_frame_gcb.DisposalMode != DISPOSE_PREVIOUS) break;
--src_frame_num;
}
if (src_frame_num >= 0) {
// Restore pixels inside previous frame rectangle to
// corresponding pixels in source canvas.
uint8_t* const src_frame_rgba =
image->frames[src_frame_num].rgba;
CopyFrameRectangle(src_frame_rgba, curr_rgba,
canvas_width_in_bytes,
prev_desc->Left, prev_desc->Top,
prev_desc->Width, prev_desc->Height);
} else {
// Source canvas doesn't exist. So clear previous frame
// rectangle to background.
ZeroFillFrameRect(curr_rgba, canvas_width_in_bytes,
prev_desc->Left, prev_desc->Top,
prev_desc->Width, prev_desc->Height);
}
break;
}
default:
break; // Nothing to do.
}
}
}
}
// Decode current frame.
if (!ReadFrameGIF(curr_gif_image, gif->SColorMap, curr_gcb.TransparentColor,
canvas_width_in_bytes, curr_rgba)) {
DGifCloseFile(gif, NULL);
return 0;
}
if (dump_frames) {
if (!DumpFrame(filename, dump_folder, i, curr_rgba,
canvas_width, canvas_height)) {
DGifCloseFile(gif, NULL);
return 0;
}
}
}
DGifCloseFile(gif, NULL);
return 1;
}
// Get duration of 'n'th frame in milliseconds.
static int GetFrameDurationGIF(GifFileType* gif, int n) {
GraphicsControlBlock gcb;
memset(&gcb, 0, sizeof(gcb));
DGifSavedExtensionToGCB(gif, n, &gcb);
return gcb.DelayTime * 10;
}
static int GetTransparentIndexGIF(GifFileType* gif) {
GraphicsControlBlock first_gcb;
memset(&first_gcb, 0, sizeof(first_gcb));
DGifSavedExtensionToGCB(gif, 0, &first_gcb);
return first_gcb.TransparentColor;
}
void AnimatedImage::extractGifData(const GifFileType *gifFile) {
PixelAccessor *pa = NULL;
GifFrame *frame = NULL;
try {
m_size.cx = gifFile->SWidth;
m_size.cy = gifFile->SHeight;
m_workPr = new PixRect(m_device, PIXRECT_TEXTURE, m_size); TRACE_NEW(m_workPr);
const int imageCount = gifFile->ImageCount;
ColorMapObject *gfColorMap = gifFile->SColorMap;
const GifColorType &colorType = gfColorMap->Colors[gifFile->SBackGroundColor];
const int bitsPerPixel = gfColorMap->BitsPerPixel;
m_backgroundColor = D3DCOLOR_RGBA(colorType.Red, colorType.Green, colorType.Blue,255);
for(int k = 0; k < gifFile->ExtensionBlockCount; k++) {
const ExtensionBlock &block = gifFile->ExtensionBlocks[k];
switch(block.Function) {
case COMMENT_EXT_FUNC_CODE:
m_comment += format(_T("%*.*s"), block.ByteCount, block.ByteCount, block.Bytes);
break;
case APPLICATION_EXT_FUNC_CODE:
parseApplicationBlock(block.Bytes, block.ByteCount);
break;
}
}
m_frameTable.setCapacity(imageCount);
for(int i = 0; i < imageCount; i++) {
SavedImage &image = gifFile->SavedImages[i];
m_frameTable.add(GifFrame());
frame = &m_frameTable.last();
String imageComment;
for(int k = 0; k < image.ExtensionBlockCount; k++) {
const ExtensionBlock &block = image.ExtensionBlocks[k];
switch(block.Function) {
case COMMENT_EXT_FUNC_CODE:
imageComment += format(_T("%*.*s"), block.ByteCount, block.ByteCount, block.Bytes);
break;
case APPLICATION_EXT_FUNC_CODE:
parseApplicationBlock(block.Bytes, block.ByteCount);
break;
}
}
if(imageComment.length() > 0) {
m_comment += _T("\n") + imageComment;
}
frame->m_owner = this;
frame->m_rect.left = image.ImageDesc.Left;
frame->m_rect.top = image.ImageDesc.Top;
frame->m_rect.right = image.ImageDesc.Left + image.ImageDesc.Width;
frame->m_rect.bottom = image.ImageDesc.Top + image.ImageDesc.Height;
frame->m_srcRect = CRect(0,0, image.ImageDesc.Width, image.ImageDesc.Height);
int transparentColor = NO_TRANSPARENT_COLOR;
GraphicsControlBlock gcb;
if(DGifSavedExtensionToGCB((GifFileType*)gifFile, i, &gcb) == GIF_OK) {
frame->m_disposalMode = gcb.DisposalMode;
frame->m_delayTime = max(60,10*gcb.DelayTime);
if((transparentColor = gcb.TransparentColor) != NO_TRANSPARENT_COLOR) {
frame->m_useTransparency = true;
}
}
const CSize sz = frame->m_rect.Size();
frame->m_pr = new PixRect(m_device, PIXRECT_TEXTURE, sz, D3DPOOL_SYSTEMMEM, D3DFMT_A8R8G8B8); TRACE_NEW(frame->m_pr);
const ColorMapObject *colorMap = image.ImageDesc.ColorMap ? image.ImageDesc.ColorMap : gfColorMap;
const GifColorType *colors = colorMap->Colors;
const GifPixelType *pixelp = image.RasterBits;
pa = frame->m_pr->getPixelAccessor(0 /*D3DLOCK_NOSYSLOCK | D3DLOCK_NO_DIRTY_UPDATE | D3DLOCK_NOOVERWRITE*/);
for(CPoint p(0,0); p.y < sz.cy; p.y++) {
for(p.x = 0; p.x < sz.cx; p.x++) {
const int entry = *(pixelp++);
if((entry == transparentColor) && frame->m_useTransparency) {
pa->setPixel(p, D3DCOLOR_RGBA(0,0,0,0));
} else {
const GifColorType &mapEntry = colors[entry];
pa->setPixel(p, D3DCOLOR_RGBA(mapEntry.Red, mapEntry.Green, mapEntry.Blue, 255));
}
}
}
frame->m_pr->releasePixelAccessor();
pa = NULL;
// frame.m_pr->moveToPool(D3DPOOL_DEFAULT);
}
} catch(...) {
if(pa) {
frame->m_pr->releasePixelAccessor();
}
unload();
throw;
}
}
