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evas: Add support for region load with PNG files 

Summary:
PNG loader support  region_set when decoding
@feature

Reviewers: cedric, jpeg, jypark, raster

Subscribers: raster

Differential Revision: https://phab.enlightenment.org/D4165
This commit is contained in:
jiin.moon 2016-08-17 16:07:22 +09:00 committed by Jean-Philippe Andre
parent a76fd7b37e
commit 922a1bcd9e
1 changed files with 54 additions and 10 deletions
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64
src/modules/evas/image_loaders/png/evas_image_load_png.c
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@ -156,7 +156,27 @@ evas_image_load_file_head_png(void *loader_data,
*error = EVAS_LOAD_ERROR_GENERIC;
goto close_file;
}
if (opts->scale_down_by > 1)
if (opts->region.w > 0 && opts->region.h > 0)
{
if ((w32 < opts->region.x + opts->region.w) ||
(h32 < opts->region.y + opts->region.h))
{
*error = EVAS_LOAD_ERROR_GENERIC;
goto close_file;
}
if(opts->scale_down_by > 1)
{
prop->w = opts->region.w / opts->scale_down_by;
prop->h = opts->region.h / opts->scale_down_by;
}
else
{
prop->w = opts->region.w;
prop->h = opts->region.h;
}
}
else if (opts->scale_down_by > 1)
{
prop->w = (int) w32 / opts->scale_down_by;
prop->h = (int) h32 / opts->scale_down_by;
@ -222,6 +242,7 @@ evas_image_load_file_data_png(void *loader_data,
char passes;
int i, j, p, k;
volatile int scale_ratio = 1;
volatile int region_set = 0;
int image_w = 0, image_h = 0;
volatile Eina_Bool r = EINA_FALSE;
@ -287,11 +308,20 @@ evas_image_load_file_data_png(void *loader_data,
w32 /= scale_ratio;
h32 /= scale_ratio;
}
if ((opts->region.w > 0 && opts->region.h > 0) &&
(opts->region.w != image_w || opts->region.h != image_h))
{
w32 = opts->region.w / scale_ratio;
h32 = opts->region.h / scale_ratio;
region_set = 1;
}
if (prop->w != w32 ||
prop->h != h32)
{
*error = EVAS_LOAD_ERROR_GENERIC;
goto close_file;
*error = EVAS_LOAD_ERROR_GENERIC;
goto close_file;
}
surface = pixels;
@ -354,7 +384,7 @@ evas_image_load_file_data_png(void *loader_data,
passes = png_set_interlace_handling(png_ptr);
/* we read image line by line if scale down was set */
if (scale_ratio == 1)
if (scale_ratio == 1 && region_set == 0)
{
for (p = 0; p < passes; p++)
{
@ -366,15 +396,26 @@ evas_image_load_file_data_png(void *loader_data,
else
{
unsigned char *src_ptr, *dst_ptr;
int skip_row = 0, region_x = 0, region_y = 0;
dst_ptr = surface;
if (region_set)
{
region_x = opts->region.x;
region_y = opts->region.y;
}
if (passes == 1)
{
tmp_line = (unsigned char *) alloca(image_w * pack_offset);
for (skip_row = 0; skip_row < region_y; skip_row++)
png_read_row(png_ptr, tmp_line, NULL);
for (i = 0; i < h; i++)
{
png_read_row(png_ptr, tmp_line, NULL);
src_ptr = tmp_line;
src_ptr = tmp_line + region_x * pack_offset;
for (j = 0; j < w; j++)
{
for (k = 0; k < (int)pack_offset; k++)
@ -385,6 +426,8 @@ evas_image_load_file_data_png(void *loader_data,
for (j = 0; j < (scale_ratio - 1); j++)
png_read_row(png_ptr, tmp_line, NULL);
}
for (skip_row = region_y + h * scale_ratio; skip_row < image_h; skip_row++)
png_read_row(png_ptr, tmp_line, NULL);
}
else
{
@ -397,17 +440,18 @@ evas_image_load_file_data_png(void *loader_data,
for (i = 0; i < image_h; i++)
png_read_row(png_ptr, pixels2 + (i * image_w * pack_offset), NULL);
}
src_ptr = pixels2 + (region_y * image_w * pack_offset) + region_x * pack_offset;
for (i = 0; i < h; i++)
{
src_ptr = pixels2 + (i * scale_ratio * image_w * pack_offset);
for (j = 0; j < w; j++)
{
for (k = 0; k < (int)pack_offset; k++)
dst_ptr[k] = src_ptr[k];
src_ptr += scale_ratio * pack_offset;
dst_ptr[k] = src_ptr[k + scale_ratio * j * pack_offset];
dst_ptr += pack_offset;
}
src_ptr += scale_ratio * image_w * pack_offset;
}
free(pixels2);
}