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cogl/tests/conform/test-premult.c

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#include <cogl/cogl.h>
#include <string.h>
#include "test-utils.h"
#define QUAD_WIDTH 32
#define RED 0
#define GREEN 1
#define BLUE 2
#define ALPHA 3
#define MASK_RED(COLOR) ((COLOR & 0xff000000) >> 24)
#define MASK_GREEN(COLOR) ((COLOR & 0xff0000) >> 16)
#define MASK_BLUE(COLOR) ((COLOR & 0xff00) >> 8)
#define MASK_ALPHA(COLOR) (COLOR & 0xff)
typedef enum _MakeTextureFlags
{
TEXTURE_FLAG_SET_PREMULTIPLIED = 1,
TEXTURE_FLAG_SET_UNPREMULTIPLIED = 1<<1,
} MakeTextureFlags;
static guchar *
gen_tex_data (uint32_t color)
{
guchar *tex_data, *p;
uint8_t r = MASK_RED (color);
uint8_t g = MASK_GREEN (color);
uint8_t b = MASK_BLUE (color);
uint8_t a = MASK_ALPHA (color);
tex_data = g_malloc (QUAD_WIDTH * QUAD_WIDTH * 4);
for (p = tex_data + QUAD_WIDTH * QUAD_WIDTH * 4; p > tex_data;)
{
*(--p) = a;
*(--p) = b;
*(--p) = g;
*(--p) = r;
}
return tex_data;
}
static CoglTexture *
make_texture (uint32_t color,
CoglPixelFormat src_format,
MakeTextureFlags flags)
{
static CoglUserDataKey bitmap_free_key;
CoglTexture2D *tex_2d;
guchar *tex_data = gen_tex_data (color);
CoglBitmap *bmp = cogl_bitmap_new_for_data (test_ctx,
QUAD_WIDTH,
QUAD_WIDTH,
src_format,
QUAD_WIDTH * 4,
tex_data);
cogl_object_set_user_data (COGL_OBJECT (bmp),
&bitmap_free_key,
tex_data,
g_free);
tex_2d = cogl_texture_2d_new_from_bitmap (bmp);
if (flags & TEXTURE_FLAG_SET_PREMULTIPLIED)
cogl_texture_set_premultiplied (tex_2d, TRUE);
else if (flags & TEXTURE_FLAG_SET_UNPREMULTIPLIED)
cogl_texture_set_premultiplied (tex_2d, FALSE);
cogl_object_unref (bmp);
return tex_2d;
}
static void
set_region (CoglTexture *tex,
uint32_t color,
CoglPixelFormat format)
{
guchar *tex_data = gen_tex_data (color);
cogl_texture_set_region (tex,
QUAD_WIDTH, QUAD_WIDTH, /* height */
format,
0, /* auto compute row stride */
tex_data,
0, 0, /* dst x,y */
0, /* level */
NULL); /* don't catch errors */
}
static void
check_texture (CoglPipeline *pipeline,
int x,
int y,
CoglTexture *tex,
uint32_t expected_result)
{
cogl_pipeline_set_layer_texture (pipeline, 0, tex);
cogl_framebuffer_draw_rectangle (test_fb, pipeline,
x * QUAD_WIDTH,
y * QUAD_WIDTH,
x * QUAD_WIDTH + QUAD_WIDTH,
y * QUAD_WIDTH + QUAD_WIDTH);
test_utils_check_pixel (test_fb,
x * QUAD_WIDTH + QUAD_WIDTH / 2,
y * QUAD_WIDTH + QUAD_WIDTH / 2,
expected_result);
}
void
test_premult (void)
{
CoglPipeline *pipeline;
CoglTexture *tex;
cogl_framebuffer_orthographic (test_fb, 0, 0,
cogl_framebuffer_get_width (test_fb),
cogl_framebuffer_get_height (test_fb),
-1,
100);
cogl_framebuffer_clear4f (test_fb,
COGL_BUFFER_BIT_COLOR,
1.0f, 1.0f, 1.0f, 1.0f);
pipeline = cogl_pipeline_new (test_ctx);
cogl_pipeline_set_blend (pipeline,
"RGBA = ADD (SRC_COLOR, 0)", NULL);
cogl_pipeline_set_layer_combine (pipeline, 0,
"RGBA = REPLACE (TEXTURE)", NULL);
/* If the user explicitly specifies an unmultiplied internal format then
* Cogl shouldn't automatically premultiply the given texture data... */
if (cogl_test_verbose ())
g_print ("make_texture (0xff00ff80, "
"src = RGBA_8888, internal = RGBA_8888)\n");
tex = make_texture (0xff00ff80,
COGL_PIXEL_FORMAT_RGBA_8888, /* src format */
TEXTURE_FLAG_SET_UNPREMULTIPLIED);
check_texture (pipeline, 0, 0, /* position */
tex,
0xff00ff80); /* expected */
/* If the user explicitly requests a premultiplied internal format and
* gives unmultiplied src data then Cogl should always premultiply that
* for us */
if (cogl_test_verbose ())
g_print ("make_texture (0xff00ff80, "
"src = RGBA_8888, internal = RGBA_8888_PRE)\n");
tex = make_texture (0xff00ff80,
COGL_PIXEL_FORMAT_RGBA_8888, /* src format */
TEXTURE_FLAG_SET_PREMULTIPLIED);
check_texture (pipeline, 1, 0, /* position */
tex,
0x80008080); /* expected */
/* If the user doesn't explicitly declare that the texture is premultiplied
* then Cogl should assume it is by default should premultiply
* unpremultiplied texture data...
*/
if (cogl_test_verbose ())
g_print ("make_texture (0xff00ff80, "
"src = RGBA_8888, internal = ANY)\n");
tex = make_texture (0xff00ff80,
COGL_PIXEL_FORMAT_RGBA_8888, /* src format */
0); /* default premultiplied status */
check_texture (pipeline, 2, 0, /* position */
tex,
0x80008080); /* expected */
/* If the user requests a premultiplied internal texture format and supplies
* premultiplied source data, Cogl should never modify that source data...
*/
if (cogl_test_verbose ())
g_print ("make_texture (0x80008080, "
"src = RGBA_8888_PRE, "
"internal = RGBA_8888_PRE)\n");
tex = make_texture (0x80008080,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* src format */
TEXTURE_FLAG_SET_PREMULTIPLIED);
check_texture (pipeline, 3, 0, /* position */
tex,
0x80008080); /* expected */
/* If the user requests an unmultiplied internal texture format, but
* supplies premultiplied source data, then Cogl should always
* un-premultiply the source data... */
if (cogl_test_verbose ())
g_print ("make_texture (0x80008080, "
"src = RGBA_8888_PRE, internal = RGBA_8888)\n");
tex = make_texture (0x80008080,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* src format */
TEXTURE_FLAG_SET_UNPREMULTIPLIED);
check_texture (pipeline, 4, 0, /* position */
tex,
0xff00ff80); /* expected */
/* If the user allows any internal texture format and provides premultipled
* source data then by default Cogl shouldn't modify the source data...
* (In the future there will be additional Cogl API to control this
* behaviour) */
if (cogl_test_verbose ())
g_print ("make_texture (0x80008080, "
"src = RGBA_8888_PRE, internal = ANY)\n");
tex = make_texture (0x80008080,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* src format */
0); /* default premultiplied status */
check_texture (pipeline, 5, 0, /* position */
tex,
0x80008080); /* expected */
/*
* Test cogl_texture_set_region() ....
*/
if (cogl_test_verbose ())
g_print ("make_texture (0xDEADBEEF, "
"src = RGBA_8888, internal = RGBA_8888)\n");
tex = make_texture (0xDEADBEEF,
COGL_PIXEL_FORMAT_RGBA_8888, /* src format */
TEXTURE_FLAG_SET_UNPREMULTIPLIED);
if (cogl_test_verbose ())
g_print ("set_region (0xff00ff80, RGBA_8888)\n");
set_region (tex, 0xff00ff80, COGL_PIXEL_FORMAT_RGBA_8888);
check_texture (pipeline, 6, 0, /* position */
tex,
0xff00ff80); /* expected */
/* Updating a texture region for an unmultiplied texture using premultiplied
* region data should result in Cogl unmultiplying the given region data...
*/
if (cogl_test_verbose ())
g_print ("make_texture (0xDEADBEEF, "
"src = RGBA_8888, internal = RGBA_8888)\n");
tex = make_texture (0xDEADBEEF,
COGL_PIXEL_FORMAT_RGBA_8888, /* src format */
TEXTURE_FLAG_SET_UNPREMULTIPLIED);
if (cogl_test_verbose ())
g_print ("set_region (0x80008080, RGBA_8888_PRE)\n");
set_region (tex, 0x80008080, COGL_PIXEL_FORMAT_RGBA_8888_PRE);
check_texture (pipeline, 7, 0, /* position */
tex,
0xff00ff80); /* expected */
if (cogl_test_verbose ())
g_print ("make_texture (0xDEADBEEF, "
"src = RGBA_8888_PRE, "
"internal = RGBA_8888_PRE)\n");
tex = make_texture (0xDEADBEEF,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* src format */
TEXTURE_FLAG_SET_PREMULTIPLIED);
if (cogl_test_verbose ())
g_print ("set_region (0x80008080, RGBA_8888_PRE)\n");
set_region (tex, 0x80008080, COGL_PIXEL_FORMAT_RGBA_8888_PRE);
check_texture (pipeline, 8, 0, /* position */
tex,
0x80008080); /* expected */
/* Updating a texture region for a premultiplied texture using unmultiplied
* region data should result in Cogl premultiplying the given region data...
*/
if (cogl_test_verbose ())
g_print ("make_texture (0xDEADBEEF, "
"src = RGBA_8888_PRE, "
"internal = RGBA_8888_PRE)\n");
tex = make_texture (0xDEADBEEF,
COGL_PIXEL_FORMAT_RGBA_8888_PRE, /* src format */
TEXTURE_FLAG_SET_PREMULTIPLIED);
if (cogl_test_verbose ())
g_print ("set_region (0xff00ff80, RGBA_8888)\n");
set_region (tex, 0xff00ff80, COGL_PIXEL_FORMAT_RGBA_8888);
check_texture (pipeline, 9, 0, /* position */
tex,
0x80008080); /* expected */
if (cogl_test_verbose ())
g_print ("OK\n");
}
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