cogl-texture: Remove unused function
Commit d8f2f583e6 removed the only caller.
This commit is contained in:
Florian Müllner
parent
c75eac27a8
commit
748223b896
@ -542,285 +542,6 @@ cogl_texture_set_data (CoglTexture *texture,
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error);
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}
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/* Reads back the contents of a texture by rendering it to the framebuffer
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* and reading back the resulting pixels.
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*
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* It will perform multiple renders if the texture is larger than the
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* current glViewport.
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*
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* It assumes the projection and modelview have already been setup so
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* that rendering to 0,0 with the same width and height of the viewport
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* will exactly cover the viewport.
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*
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* NB: Normally this approach isn't normally used since we can just use
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* glGetTexImage, but may be used as a fallback in some circumstances.
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*/
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static CoglBool
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do_texture_draw_and_read (CoglFramebuffer *fb,
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CoglPipeline *pipeline,
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CoglTexture *texture,
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CoglBitmap *target_bmp,
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float *viewport,
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CoglError **error)
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{
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float rx1, ry1;
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float rx2, ry2;
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float tx1, ty1;
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float tx2, ty2;
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int bw, bh;
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CoglBitmap *rect_bmp;
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unsigned int tex_width, tex_height;
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CoglContext *ctx = fb->context;
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tex_width = cogl_texture_get_width (texture);
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tex_height = cogl_texture_get_height (texture);
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ry2 = 0;
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ty2 = 0;
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/* Walk Y axis until whole bitmap height consumed */
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for (bh = tex_height; bh > 0; bh -= viewport[3])
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{
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/* Rectangle Y coords */
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ry1 = ry2;
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ry2 += (bh < viewport[3]) ? bh : viewport[3];
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/* Normalized texture Y coords */
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ty1 = ty2;
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ty2 = (ry2 / (float) tex_height);
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rx2 = 0;
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tx2 = 0;
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/* Walk X axis until whole bitmap width consumed */
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for (bw = tex_width; bw > 0; bw-=viewport[2])
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{
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int width;
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int height;
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/* Rectangle X coords */
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rx1 = rx2;
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rx2 += (bw < viewport[2]) ? bw : viewport[2];
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width = rx2 - rx1;
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height = ry2 - ry1;
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/* Normalized texture X coords */
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tx1 = tx2;
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tx2 = (rx2 / (float) tex_width);
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/* Draw a portion of texture */
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cogl_framebuffer_draw_textured_rectangle (fb,
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pipeline,
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0, 0,
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rx2 - rx1,
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ry2 - ry1,
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tx1, ty1,
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tx2, ty2);
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/* Read into a temporary bitmap */
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rect_bmp = _cogl_bitmap_new_with_malloc_buffer
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(ctx,
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width, height,
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COGL_PIXEL_FORMAT_RGBA_8888_PRE,
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error);
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if (!rect_bmp)
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return FALSE;
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if (!_cogl_framebuffer_read_pixels_into_bitmap
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(fb,
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viewport[0], viewport[1],
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COGL_READ_PIXELS_COLOR_BUFFER,
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rect_bmp,
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error))
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{
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cogl_object_unref (rect_bmp);
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return FALSE;
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}
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/* Copy to target bitmap */
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if (!_cogl_bitmap_copy_subregion (rect_bmp,
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target_bmp,
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0, 0,
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rx1, ry1,
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width,
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height,
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error))
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{
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cogl_object_unref (rect_bmp);
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return FALSE;
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}
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/* Free temp bitmap */
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cogl_object_unref (rect_bmp);
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}
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}
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return TRUE;
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}
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/* Reads back the contents of a texture by rendering it to the framebuffer
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* and reading back the resulting pixels.
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*
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* NB: Normally this approach isn't normally used since we can just use
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* glGetTexImage, but may be used as a fallback in some circumstances.
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*/
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static CoglBool
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_cogl_texture_draw_and_read (CoglTexture *texture,
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CoglBitmap *target_bmp,
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GLuint target_gl_format,
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GLuint target_gl_type,
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CoglError **error)
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{
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CoglFramebuffer *framebuffer = cogl_get_draw_framebuffer ();
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CoglContext *ctx = framebuffer->context;
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float save_viewport[4];
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float viewport[4];
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CoglBool status = FALSE;
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viewport[0] = 0;
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viewport[1] = 0;
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viewport[2] = cogl_framebuffer_get_width (framebuffer);
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viewport[3] = cogl_framebuffer_get_height (framebuffer);
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cogl_framebuffer_get_viewport4fv (framebuffer, save_viewport);
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_cogl_framebuffer_push_projection (framebuffer);
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cogl_framebuffer_orthographic (framebuffer,
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0, 0,
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viewport[2],
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viewport[3],
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0, 100);
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cogl_framebuffer_push_matrix (framebuffer);
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cogl_framebuffer_identity_matrix (framebuffer);
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/* Direct copy operation */
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if (ctx->texture_download_pipeline == NULL)
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{
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ctx->texture_download_pipeline = cogl_pipeline_new (ctx);
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cogl_pipeline_set_blend (ctx->texture_download_pipeline,
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"RGBA = ADD (SRC_COLOR, 0)",
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NULL);
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}
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cogl_pipeline_set_layer_texture (ctx->texture_download_pipeline, 0, texture);
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cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
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0, /* layer */
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"RGBA = REPLACE (TEXTURE)",
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NULL);
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cogl_pipeline_set_layer_filters (ctx->texture_download_pipeline, 0,
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COGL_PIPELINE_FILTER_NEAREST,
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COGL_PIPELINE_FILTER_NEAREST);
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if (!do_texture_draw_and_read (framebuffer,
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ctx->texture_download_pipeline,
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texture, target_bmp, viewport,
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error))
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return FALSE;
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/* XXX: As an alleged PowerVR driver bug workaround where the driver
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* is apparently not maintaining the alpha component of some
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* framebuffers we render the alpha component of the texture
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* separately to be sure we retrieve all components of the texture.
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*
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* TODO: verify if this is still an issue
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*/
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if ((_cogl_texture_get_format (texture) & COGL_A_BIT)/* && a_bits == 0*/)
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{
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uint8_t *srcdata;
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uint8_t *dstdata;
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uint8_t *srcpixel;
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uint8_t *dstpixel;
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int target_width = cogl_bitmap_get_width (target_bmp);
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int target_height = cogl_bitmap_get_height (target_bmp);
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int target_rowstride = cogl_bitmap_get_rowstride (target_bmp);
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int bpp = _cogl_pixel_format_get_bytes_per_pixel (COGL_PIXEL_FORMAT_RGBA_8888);
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int alpha_rowstride = bpp * target_width;
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CoglBitmap *alpha_bmp;
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int x,y;
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if ((dstdata = _cogl_bitmap_map (target_bmp,
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COGL_BUFFER_ACCESS_WRITE,
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COGL_BUFFER_MAP_HINT_DISCARD,
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error)) == NULL)
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goto EXIT;
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/* Create temp bitmap for alpha values */
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alpha_bmp =
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_cogl_bitmap_new_with_malloc_buffer (ctx,
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target_width,
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target_height,
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COGL_PIXEL_FORMAT_RGBA_8888,
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error);
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if (!alpha_bmp)
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{
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_cogl_bitmap_unmap (target_bmp);
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goto EXIT;
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}
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/* Draw alpha values into RGB channels */
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cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
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0, /* layer */
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"RGBA = REPLACE (TEXTURE[A])",
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NULL);
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if (!do_texture_draw_and_read (framebuffer,
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ctx->texture_download_pipeline,
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texture, alpha_bmp, viewport,
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error))
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{
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cogl_object_unref (alpha_bmp);
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_cogl_bitmap_unmap (target_bmp);
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goto EXIT;
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}
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/* Copy temp R to target A */
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/* Note: we don't try to catch errors since "mapping" an
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* malloc buffer should never fail */
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srcdata = _cogl_bitmap_map (alpha_bmp,
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COGL_BUFFER_ACCESS_READ,
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0 /* hints */,
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NULL);
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for (y=0; y<target_height; ++y)
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{
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for (x=0; x<target_width; ++x)
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{
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srcpixel = srcdata + x*bpp;
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dstpixel = dstdata + x*bpp;
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dstpixel[3] = srcpixel[0];
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}
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srcdata += alpha_rowstride;
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dstdata += target_rowstride;
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}
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_cogl_bitmap_unmap (alpha_bmp);
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_cogl_bitmap_unmap (target_bmp);
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cogl_object_unref (alpha_bmp);
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}
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status = TRUE;
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EXIT:
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/* Restore old state */
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cogl_framebuffer_pop_matrix (framebuffer);
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_cogl_framebuffer_pop_projection (framebuffer);
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cogl_framebuffer_set_viewport (framebuffer,
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save_viewport[0],
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save_viewport[1],
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save_viewport[2],
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save_viewport[3]);
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return status;
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}
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static CoglBool
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get_texture_bits_via_offscreen (CoglTexture *meta_texture,
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CoglTexture *sub_texture,
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