1 files changed, 57 insertions, 0 deletions
diff --git a/skia/gl/SkGLDevice_FBO.cpp b/skia/gl/SkGLDevice_FBO.cpp
new file mode 100644
index 0000000..552d619
--- /dev/null
+++ b/skia/gl/SkGLDevice_FBO.cpp
@@ -0,0 +1,57 @@
+#include "SkGLDevice_FBO.h"
+#include "SkRegion.h"
+
+SkGLDevice_FBO::SkGLDevice_FBO(const SkBitmap& bitmap, bool offscreen)
+        : SkGLDevice(bitmap, offscreen) {
+    fFBO = 0;
+    fTextureID = 0;
+
+    if (offscreen) {
+        int nw = SkNextPow2(bitmap.rowBytesAsPixels());
+        int nh = SkNextPow2(bitmap.height());
+        
+        glGenFramebuffersEXT(1, &fFBO);
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fFBO);
+
+        glGenTextures(1, &fTextureID);
+        glBindTexture(GL_TEXTURE_2D, fTextureID);
+        SkGL::SetTexParamsClamp(false);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, nw, nh, 0,
+                     GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+
+        glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+                                  GL_TEXTURE_2D, fTextureID, 0);
+        GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+        if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+            SkDebugf("-- glCheckFramebufferStatusEXT %x\n", status);
+        }
+
+        // now reset back to "normal" drawing target
+        glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+    }
+}
+
+SkGLDevice_FBO::~SkGLDevice_FBO() {
+    if (fTextureID) {
+        glDeleteTextures(1, &fTextureID);
+    }
+    if (fFBO) {
+        glDeleteFramebuffersEXT(1, &fFBO);
+    }
+}
+
+SkGLDevice::TexOrientation SkGLDevice_FBO::bindDeviceAsTexture() {
+    if (fTextureID) {
+        glBindTexture(GL_TEXTURE_2D, fTextureID);
+        return kBottomToTop_TexOrientation;
+    }
+    return kNo_TexOrientation;
+}
+
+void SkGLDevice_FBO::gainFocus(SkCanvas* canvas) {
+    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fFBO);
+
+    // now we're ready for the viewport and projection matrix
+    this->INHERITED::gainFocus(canvas);
+}
+