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png: Refactor png saving
Do all the memory format shenanigans in GTK now and support all the PNG formats.
This commit is contained in:
Benjamin Otte
parent
1e7fb52b21
commit
c2368cc605
@ -127,85 +127,6 @@ png_simple_warning_callback (png_structp png,
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{
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}
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/* }}} */
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/* {{{ Format conversion */
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static void
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unpremultiply (guchar *data,
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int width,
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int height)
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{
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gsize x, y;
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for (y = 0; y < height; y++)
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{
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for (x = 0; x < width; x++)
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{
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guchar *b = &data[x * 4];
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guint32 pixel;
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guchar alpha;
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memcpy (&pixel, b, sizeof (guint32));
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alpha = (pixel & 0xff000000) >> 24;
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if (alpha == 0)
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{
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b[0] = 0;
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b[1] = 0;
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b[2] = 0;
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b[3] = 0;
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}
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else
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{
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b[0] = (((pixel & 0x00ff0000) >> 16) * 255 + alpha / 2) / alpha;
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b[1] = (((pixel & 0x0000ff00) >> 8) * 255 + alpha / 2) / alpha;
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b[2] = (((pixel & 0x000000ff) >> 0) * 255 + alpha / 2) / alpha;
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b[3] = alpha;
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}
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}
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data += width * 4;
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}
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}
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static void
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unpremultiply_float_to_16bit (guchar *data,
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int width,
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int height)
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{
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gsize x, y;
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float *src = (float *)data;;
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guint16 *dest = (guint16 *)data;
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for (y = 0; y < height; y++)
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{
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for (x = 0; x < width; x++)
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{
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float r, g, b, a;
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r = src[0];
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g = src[1];
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b = src[2];
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a = src[3];
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if (a == 0)
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{
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dest[0] = 0;
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dest[1] = 0;
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dest[2] = 0;
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dest[3] = 0;
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}
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else
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{
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dest[0] = (guint16) CLAMP (65536.f * r / a, 0.f, 65535.f);
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dest[1] = (guint16) CLAMP (65536.f * g / a, 0.f, 65535.f);
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dest[2] = (guint16) CLAMP (65536.f * b / a, 0.f, 65535.f);
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dest[3] = (guint16) CLAMP (65536.f * a, 0.f, 65535.f);
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}
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dest += 4;
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src += 4;
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}
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}
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}
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/* }}} */
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/* {{{ Public API */
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@ -382,11 +303,11 @@ gdk_save_png (GdkTexture *texture)
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png_struct *png = NULL;
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png_info *info;
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png_io io = { NULL, 0, 0 };
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guint width, height, stride;
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guchar *data = NULL;
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guchar *row;
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int width, height;
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gsize stride;
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const guchar *data;
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int y;
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GdkTexture *mtexture;
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GdkMemoryTexture *memtex;
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GdkMemoryFormat format;
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int png_format;
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int depth;
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@ -395,8 +316,6 @@ gdk_save_png (GdkTexture *texture)
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height = gdk_texture_get_height (texture);
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format = gdk_texture_get_format (texture);
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mtexture = GDK_TEXTURE (gdk_memory_texture_from_texture (texture, format));
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switch (format)
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{
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case GDK_MEMORY_B8G8R8A8_PREMULTIPLIED:
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@ -406,32 +325,42 @@ gdk_save_png (GdkTexture *texture)
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case GDK_MEMORY_A8R8G8B8:
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case GDK_MEMORY_R8G8B8A8:
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case GDK_MEMORY_A8B8G8R8:
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case GDK_MEMORY_R8G8B8:
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case GDK_MEMORY_B8G8R8:
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stride = width * 4;
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data = g_malloc_n (stride, height);
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gdk_texture_download (mtexture, data, stride);
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unpremultiply (data, width, height);
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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format = GDK_MEMORY_R8G8B8A8;
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#elif G_BYTE_ORDER == G_BIG_ENDIAN
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format = GDK_MEMORY_A8B8G8R8;
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#endif
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png_format = PNG_COLOR_TYPE_RGB_ALPHA;
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depth = 8;
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break;
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case GDK_MEMORY_R16G16B16:
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case GDK_MEMORY_R8G8B8:
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case GDK_MEMORY_B8G8R8:
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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format = GDK_MEMORY_R8G8B8;
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#elif G_BYTE_ORDER == G_BIG_ENDIAN
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format = GDK_MEMORY_B8G8R8;
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#endif
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png_format = PNG_COLOR_TYPE_RGB;
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depth = 8;
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break;
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case GDK_MEMORY_R16G16B16A16:
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case GDK_MEMORY_R16G16B16A16_PREMULTIPLIED:
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case GDK_MEMORY_R16G16B16_FLOAT:
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case GDK_MEMORY_R16G16B16A16_FLOAT:
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case GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED:
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case GDK_MEMORY_R32G32B32_FLOAT:
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case GDK_MEMORY_R32G32B32A32_FLOAT:
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case GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED:
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data = g_malloc_n (width * 16, height);
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gdk_texture_download_float (mtexture, (float *)data, width * 4);
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unpremultiply_float_to_16bit (data, width, height);
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format = GDK_MEMORY_R16G16B16A16;
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png_format = PNG_COLOR_TYPE_RGB_ALPHA;
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stride = width * 8;
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depth = 16;
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break;
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case GDK_MEMORY_R16G16B16:
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case GDK_MEMORY_R16G16B16_FLOAT:
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case GDK_MEMORY_R32G32B32_FLOAT:
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format = GDK_MEMORY_R16G16B16;
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png_format = PNG_COLOR_TYPE_RGB;
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depth = 16;
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break;
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@ -458,12 +387,14 @@ gdk_save_png (GdkTexture *texture)
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if (sigsetjmp (png_jmpbuf (png), 1))
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{
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g_free (data);
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g_object_unref (memtex);
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g_free (io.data);
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png_destroy_read_struct (&png, &info, NULL);
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return NULL;
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}
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memtex = gdk_memory_texture_from_texture (texture, format);
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png_set_write_fn (png, &io, png_write_func, png_flush_func);
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png_set_IHDR (png, info, width, height, depth,
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@ -478,14 +409,16 @@ gdk_save_png (GdkTexture *texture)
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png_set_swap (png);
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#endif
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for (y = 0, row = data; y < height; y++, row += stride)
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png_write_rows (png, &row, 1);
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data = gdk_memory_texture_get_data (memtex);
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stride = gdk_memory_texture_get_stride (memtex);
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for (y = 0; y < height; y++)
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png_write_row (png, data + y * stride);
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png_write_end (png, info);
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png_destroy_write_struct (&png, &info);
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g_free (data);
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g_object_unref (memtex);
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return g_bytes_new_take (io.data, io.size);
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}
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