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texture: Add gdk_texture_download_texture()
A private vfunc that downloads a texture as a GdkMemoryTexture in whatever format the texture deems best. There are multiple reasons for this: * GLES cannot download the Cairo format. But it can download some format and then just delegate to the GdkMemoryTexture implementation. * All the other download vfuncs (including the ones still coming) can be implemented via download_texture() and delegation, making the interface easier. * We want to implement image loading and saving support. By using download_texture(), we can save in the actual format of the texture. * A potential GdkCompressedTexture could be implemented by just providing this one vfunc as a compress() step.
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@ -21,7 +21,7 @@
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#include "gdkgltextureprivate.h"
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#include "gdkcairo.h"
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#include "gdkmemorytexture.h"
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#include "gdkmemorytextureprivate.h"
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#include "gdktextureprivate.h"
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#include <epoxy/gl.h>
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@ -70,6 +70,75 @@ gdk_gl_texture_dispose (GObject *object)
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G_OBJECT_CLASS (gdk_gl_texture_parent_class)->dispose (object);
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}
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static GdkTexture *
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gdk_gl_texture_download_texture (GdkTexture *texture)
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{
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GdkGLTexture *self = GDK_GL_TEXTURE (texture);
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GdkTexture *result;
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int active_texture;
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GdkMemoryFormat format;
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GLint internal_format, gl_format, gl_type;
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guchar *data;
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gsize stride;
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GBytes *bytes;
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if (self->saved)
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return g_object_ref (self->saved);
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gdk_gl_context_make_current (self->context);
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glGetIntegerv (GL_TEXTURE_BINDING_2D, &active_texture);
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glBindTexture (GL_TEXTURE_2D, self->id);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internal_format);
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switch (internal_format)
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{
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case GL_RGB8:
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format = GDK_MEMORY_R8G8B8;
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gl_format = GL_RGB;
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gl_type = GL_UNSIGNED_BYTE;
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break;
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case GL_RGBA8:
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format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
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gl_format = GL_RGBA;
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gl_type = GL_UNSIGNED_BYTE;
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break;
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default:
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g_warning ("Texture in unexpected format 0x%X (%d). File a bug about adding it to GTK", internal_format, internal_format);
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/* fallback to the dumbest possible format
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* so that even age old GLES can do it */
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format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
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gl_format = GL_RGBA;
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gl_type = GL_UNSIGNED_BYTE;
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break;
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}
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stride = gdk_memory_format_bytes_per_pixel (format) * texture->width;
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data = g_malloc (stride * texture->height);
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glGetTexImage (GL_TEXTURE_2D,
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0,
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gl_format,
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gl_type,
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data);
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bytes = g_bytes_new_take (data, stride * texture->height);
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result = gdk_memory_texture_new (texture->width,
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texture->height,
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format,
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bytes,
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stride);
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g_bytes_unref (bytes);
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glBindTexture (GL_TEXTURE_2D, active_texture);
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return result;
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}
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static void
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gdk_gl_texture_download (GdkTexture *texture,
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guchar *data,
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@ -112,6 +181,7 @@ gdk_gl_texture_class_init (GdkGLTextureClass *klass)
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GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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texture_class->download_texture = gdk_gl_texture_download_texture;
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texture_class->download = gdk_gl_texture_download;
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gobject_class->dispose = gdk_gl_texture_dispose;
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}
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@ -79,6 +79,12 @@ gdk_memory_texture_dispose (GObject *object)
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G_OBJECT_CLASS (gdk_memory_texture_parent_class)->dispose (object);
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}
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static GdkTexture *
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gdk_memory_texture_download_texture (GdkTexture *texture)
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{
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return g_object_ref (texture);
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}
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static void
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gdk_memory_texture_download (GdkTexture *texture,
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guchar *data,
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@ -101,6 +107,7 @@ gdk_memory_texture_class_init (GdkMemoryTextureClass *klass)
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GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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texture_class->download_texture = gdk_memory_texture_download_texture;
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texture_class->download = gdk_memory_texture_download;
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gobject_class->dispose = gdk_memory_texture_dispose;
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}
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@ -115,12 +115,23 @@ G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GdkTexture, gdk_texture, G_TYPE_OBJECT,
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#define GDK_TEXTURE_WARN_NOT_IMPLEMENTED_METHOD(obj,method) \
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g_critical ("Texture of type '%s' does not implement GdkTexture::" # method, G_OBJECT_TYPE_NAME (obj))
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static void
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gdk_texture_real_download (GdkTexture *self,
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guchar *data,
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gsize stride)
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static GdkTexture *
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gdk_texture_real_download_texture (GdkTexture *self)
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{
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GDK_TEXTURE_WARN_NOT_IMPLEMENTED_METHOD (self, download);
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GDK_TEXTURE_WARN_NOT_IMPLEMENTED_METHOD (self, download_texture);
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return NULL;
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}
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static void
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gdk_texture_real_download (GdkTexture *texture,
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guchar *data,
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gsize stride)
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{
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GdkTexture *memory_texture;
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memory_texture = gdk_texture_download_texture (texture);
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gdk_texture_download (memory_texture, data, stride);
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g_object_unref (memory_texture);
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}
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static void
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@ -186,6 +197,7 @@ gdk_texture_class_init (GdkTextureClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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klass->download_texture = gdk_texture_real_download_texture;
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klass->download = gdk_texture_real_download;
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gobject_class->set_property = gdk_texture_set_property;
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@ -473,6 +485,22 @@ gdk_texture_download (GdkTexture *texture,
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GDK_TEXTURE_GET_CLASS (texture)->download (texture, data, stride);
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}
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GdkTexture *
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gdk_texture_download_texture (GdkTexture *texture)
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{
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g_return_val_if_fail (GDK_IS_TEXTURE (texture), NULL);
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g_object_ref (texture);
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while (!GDK_IS_MEMORY_TEXTURE (texture))
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{
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GdkTexture *downloaded = GDK_TEXTURE_GET_CLASS (texture)->download_texture (texture);
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g_object_unref (texture);
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texture = downloaded;
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}
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return texture;
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}
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gboolean
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gdk_texture_set_render_data (GdkTexture *self,
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gpointer key,
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@ -24,6 +24,9 @@ struct _GdkTexture
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struct _GdkTextureClass {
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GObjectClass parent_class;
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/* mandatory: Download into a GdkMemoryTexture */
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GdkTexture * (* download_texture) (GdkTexture *texture);
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/* optional */
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void (* download) (GdkTexture *texture,
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guchar *data,
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gsize stride);
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@ -34,6 +37,8 @@ gpointer gdk_texture_new (const GdkTextureClass
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int height);
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GdkTexture * gdk_texture_new_for_surface (cairo_surface_t *surface);
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cairo_surface_t * gdk_texture_download_surface (GdkTexture *texture);
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/* NB: GdkMemoryTexture */
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GdkTexture * gdk_texture_download_texture (GdkTexture *texture);
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gboolean gdk_texture_set_render_data (GdkTexture *self,
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gpointer key,
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